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The results of the calculation of the inflow of pollutants into the Gulf of Finland with the outflow from Saint Petersburg watercourses are considered. Data of regular hydrochemical observations by State Unitary Enterprise “Vodokanal of Saint Petersburg” for 2018 were used for the calculation. The contribution of the megalopolis of Saint Petersburg to change of the pollutants inflow is estimated.

Influence of St. Petersburg urban rivers on the inflow of pollutants into the Baltic Sea